221227577621 has 2 divisors, whose sum is σ = 221227577622. Its totient is φ = 221227577620.

The previous prime is 221227577507. The next prime is 221227577633. The reversal of 221227577621 is 126775722122.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 181211976100 + 40015601521 = 425690^2 + 200039^2 .

It is a cyclic number.

It is not a de Polignac number, because 221227577621 - 2²⁶ = 221160468757 is a prime.

It is a super-2 number, since 2×221227577621² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221227577671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110613788810 + 110613788811.

It is an arithmetic number, because the mean of its divisors is an integer number (110613788811).

Almost surely, 2^221227577621 is an apocalyptic number.

It is an amenable number.

221227577621 is a deficient number, since it is larger than the sum of its proper divisors (1).

221227577621 is an equidigital number, since it uses as much as digits as its factorization.

221227577621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 329280, while the sum is 44.

The spelling of 221227577621 in words is "two hundred twenty-one billion, two hundred twenty-seven million, five hundred seventy-seven thousand, six hundred twenty-one".